The upower cli tool will get you a large amount of information about power and batteries in your system. Install upower using the command

yum -y install upower

To enumerate the devices upower can get information about on your system with the command

upower -e

On my system I get:

/org/freedesktop/UPower/devices/line_power_AC
/org/freedesktop/UPower/devices/battery_BAT0
/org/freedesktop/UPower/devices/DisplayDevice

To check the battery, use the correct device from above as follows:

$upower -i /org/freedesktop/UPower/devices/battery_BAT0
  native-path:          BAT0
  vendor:               Notebook
  model:                BAT
  serial:               0001
  power supply:         yes
  updated:              Tue 05 Sep 2017 11:28:45 AM EDT (62 seconds ago)
  has history:          yes
  has statistics:       yes
  battery
    present:             yes
    rechargeable:        yes
    state:               charging
    warning-level:       none
    energy:              66.8331 Wh
    energy-empty:        0 Wh
    energy-full:         67.7433 Wh
    energy-full-design:  62.16 Wh
    energy-rate:         4.0293 W
    voltage:             12.89 V
    time to full:        13.6 minutes
    percentage:          98%
    capacity:            100%
    technology:          lithium-ion
    icon-name:          'battery-full-charging-symbolic'
  History (rate):
    1504625325	4.029	charging

As you can see after ~ 2 years of extensive use, my battery is in pretty good shape:

upower can also get information about your external keyboard’s battery (if it supports it). I dont have a keyboard that supports it on my system